Authors: Adolf Peretti, Branko Deljanin, Franz Herzog, Willi Bieri, Matthias Alessandri, Detlef Günther, Daniel A. Frick, Eduard Cleaveland, Alexandre M. Zaitsev
Published in: Contributions to Gemmology No. 14
Authors: Adolf Peretti, Branko Deljanin, Franz Herzog, Willi Bieri, Matthias Alessandri, Detlef Günther, Daniel A. Frick, Eduard Cleaveland, Alexandre M. Zaitsev
Published in: Contributions to Gemmology No. 14